Factory ammunition not fitting the gauge is not an indicator of a defective gauge. The gauge is the reference tool, the ammunition is what you are inspecting. More likely, factory ammunition not fitting the gauge means the factory ammunition is out of spec. This could be from something that occured to it during shipping/handling, or it could be slightly out of spec/tolerance from the manufacturing. It is also possible to have dirt/debris on the ammunition or gauge that needs to be cleaned off.
Does all of that particular ammunition fail the gauge, or just some of it? Can you identify where it is sticking in the gauge?
This does occur, and usually the ammunition being out of spec is the issue. But we are happy to help you diagnose this, so send us a message so we can help you and make sure that the gauge is working properly.